<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
</head>
<body>

<div>
    <ul>
        <li id="l1" class="c1" id="l1">北京</li>
        <li id="l2">上海</li>
        <li>广州</li>
        <li>深圳</li>
        <a href="" class="a1">百度</a>
        <span>嘿嘿嘿</span>
    </ul>
</div>

<a href="" title="a2">Google</a>

<div id="d1">
    <span>哈哈哈</span>
</div>

<p id="p1" class="p1">呵呵呵</p>
</body>
</html>